足踝有限元模型的建立与初步临床应用  

Finite Element Model of Foot and Ankle and Initial Clinical Application

作　　者：王旭[1] 马昕[1] 陶凯[2] 顾湘杰[1] 

机构地区：[1]复旦大学附属华山医院骨科,上海200040 [2]上海交通大学生命质量与机械工程研究所,上海200240

出　　处：《中国生物医学工程学报》2008年第2期287-292,共6页Chinese Journal of Biomedical Engineering

摘　　要：建立足踝部有限元模型,研究胫后肌腱功能不全(DPTT)、外翻与第一跖列不稳的静态生物力学变化。以螺旋CT扫描正常足部图像为资源,Matlab、Surfacer、ANSYS软件为工具,建立足部有限元模型,模拟静态直立时加载,分别分析跟骨应力应变、胫后肌腱功能不全与第一跖列失稳时的内侧纵弓关节应力应变、骨骼空间位置的的变化。静态直立负重时,跟骨与第一跖骨跖侧应力最大,其中跟骨内侧最大;胫后肌腱功能不全时,可以导致第一跖列的稳定性丧失,进而发生内侧纵弓各个关节之间应力分布、大小发生变化,第一跖骨内收、跖屈,趾相对于第一跖骨外展趋势增大。足踝有限元模型是分析足踝生物力学的有力工具;跟痛症的发生与应力反复作用有关;DPPT可以导致第一跖列失稳,进而引起第一跖骨内收、趾外展,与反复应力作用下的外翻发生发展有一定关系。To establish finite element model （FEA） of foot and ankle to investigate biomechanical characteristics of the dysfunction of posterior tibial tendon （DPTT）, the relationship of hallux valgus （HV） and the first ray hypermobility, the static biomechanical characteristics of heel pain. Right foot of healthy male was scanned with spiral CT. With software of Metlab, Surfacer and ANSYS, a finite element model of normal foot was constructed. The static biomechanical characteristics of heel pain, the stress - strain of the first ray and the first metatarsophalangeal joint, the spatial location of the first ray were recorded under different conditions of normal and DPTT. In stance phase, the peak pressure was under the medial part of the calcaneus and the first metatarsal head. When the first ray became instability, the magnitude and distribution of the first ray changed. The offset magnitude of the hallux abduction was more obvious than that of the normal. FEA is a powerful tool analyzing the biomechanical characteristics of foot and ankle. There was close relationship between the first ray and hallux. Instability of the first ray can cause the first metatarsal adduction and hallux abduction. This biomechanical factor may play a role in the development of hallux valgus under repeat stress.

关 键 词：足 踝 有限元 第一跖列 

分 类 号：R318[医药卫生—生物医学工程]